nl_langinfo.m4: HAVE_LANGINFO_CODESET unquoted

[Gavin Smith]

In the nl_langinfo.m4 file, there's a test:

 if test $HAVE_LANGINFO_CODESET = 1 && test $HAVE_LANGINFO_ERA = 1 \
        && test $FUNC_NL_LANGINFO_YESEXPR_WORKS = 1; then
      :
    else

This gave an (apparently harmless) error message when configuring
under OpenIndiana 11:

./configure[22339]: test: argument expected

Maybe the variables being tested need to have their expansions
surrounded in double quotes, or whatever reason these variables aren't
set should be fixed.